If it's straight out of a mould it will have slightly rounded corners and the same shine as the rest. If it's ground it will have square corners and may have a different level of shinyness. It can help with dating, that's all.

I'd just come back to say I still can't decide on ground base or not, and will try and take some close ups of the base rim, but WOW thank-you Anne, I had a feeling it was Czech. :hiclp: Thanks also Christine for all your help. :sun: